Instrumentationmedium#412
If an aircraft climbs at constant CAS, the Mach number will:
A
Decrease
B
Fluctuate randomly
C
Stay the same
D
Increase because the speed of sound decreases with temperature (altitude)
CorrectExplanation
As altitude increases, temperature drops and the speed of sound decreases; at constant CAS (roughly constant TAS), Mach number rises.
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